Shelf



FIG. 1 is a front perspective view of the shelf showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front perspective view of the shelf of FIG. 1 shown in an optional orientation, which is the reverse of FIG. 1; and,

FIG. 5 is a fragmentary enlarged perspective view of the screen surface thereof, with the remainder of the structure omitted for clarity of illustration.

The broken-line disclosure of the supporting slot wall structures have been shown for illustrative purpose only and form no part of the claimed design. 

The ornamental design for a shelf, as shown and described. 